Replace Writer::writeToFile with writeStringToFile

Applications/DataExplorer/DataView/SaveMeshDialog.cpp

Applications/DataExplorer/mainwindow.cpp

Applications/FileIO/Legacy/createSurface.cpp

Applications/FileIO/SWMM/SWMMInterface.cpp

Applications/FileIO/XmlIO/Qt/XmlPrjInterface.cpp

Applications/FileIO/writeGeometryToFile.cpp

Applications/Utils/FileConverter/ConvertSHPToGLI.cpp

Applications/Utils/FileConverter/VTK2OGS.cpp

Applications/Utils/GeoTools/MoveGeometry.cpp

Applications/Utils/GeoTools/TriangulatePolyline.cpp

Applications/Utils/MeshEdit/MapGeometryToMeshSurface.cpp

Applications/Utils/MeshGeoTools/VerticalSliceFromLayers.cpp

Applications/Utils/OGSFileConverter/OGSFileConverter.cpp

Applications/Utils/SWMMConverter/SWMMConverter.cpp

BaseLib/IO/Writer.cpp

BaseLib/IO/Writer.h

MeshLib/IO/writeMeshToFile.cpp

Tests/FileIO/TestBoostGmlInterface.cpp

Tests/FileIO/TestCsvWriter.cpp

Tests/FileIO_Qt/TestQtGmlInterface.cpp